Clean Water Act discharge permit · NPDES IN0000124
NIPSCO D. H. MITCHELL GENERATING STATION, Gary, IN: NPDES IN0000124 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 11Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
- 0Inspections on file
- 0Formal enforcement actions
NIPSCO D. H. MITCHELL GENERATING STATION, held by NIPSCO, D H MITCHELL GENERATING STATION, holds NPDES permit IN0000124, which discharges to Lake Michigan. EPA’s file records it issued June 30, 2010 and expiring July 1, 2015. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | NIPSCO D. H. MITCHELL GENERATING STATION |
|---|---|
| Permittee as filed | NIPSCO, D H MITCHELL GENERATING STATION |
| NPDES ID | IN0000124 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | June 30, 2010 |
| Expiration date | July 1, 2015 |
| Issuing agency | IDEM |
| Address | Gary, IN 46401 |
| Receiving water | LAKE MICHIGAN |
| Subwatershed | Calumet River-Frontal Lake Michigan (HUC 040400010603) |
| SIC | 4911 – Electric Services |
| Other EPA IDs (FRS) | RCRA handler IND000807099 |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download; cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 20Pollutants on file
- 11Under a numeric limit
- 18With a violation of any kind
- 5With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| BOD, carbonaceous [5 day, 20 C] | 2 | 17 | 7 | October 31, 2002 | 800% over the limit |
| Solids, total suspended | 2 | 26 | 6 | May 31, 2004 | 205% over the limit |
| pH | 2 | 32 | 2 | May 31, 2002 | |
| Oil & Grease | 0 | 24 | 2 | September 30, 2004 | 68% over the limit |
| Iron, total [as Fe] | 0 | 7 | 2 | April 30, 1998 | 730% over the limit |
| Flow, in conduit or thru treatment plant | 6 | 46 | 0 | ||
| Chlorine, total residual | 1 | 14 | 0 | ||
| Chromium, total [as Cr] | 0 | 6 | 0 | ||
| Temperature, water deg. fahrenheit | 2 | 5 | 0 | ||
| Cadmium, total [as Cd] | 0 | 5 | 0 | ||
| Copper, total [as Cu] | 0 | 5 | 0 | ||
| Lead, total [as Pb] | 0 | 5 | 0 | ||
| Nickel, total [as Ni] | 0 | 5 | 0 | ||
| Zinc, total [as Zn] | 0 | 5 | 0 | ||
| Mercury, total [as Hg] | 0 | 5 | 0 | ||
| Oxidants, total residual | 1 | 4 | 0 | ||
| Chlorination frequency | 1 | 4 | 0 | ||
| Chlorination duration | 1 | 4 | 0 | ||
| Oil and grease, hexane extr method | 2 | 0 | 0 | ||
| Flow, total | 1 | 0 | 0 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES IN0000124.
Inspections
EPA’s inspection file holds no inspection for NPDES IN0000124.
Formal enforcement and penalties
0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.
Informal enforcement
EPA’s informal enforcement file holds no action for NPDES IN0000124.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
Watch this permit
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, IN0000124.
Start the watch
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- One watershed — $2,990/year
- One state — $4,990/year
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How we handle your data → Privacy
EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID IN0000124 there.
Nearby on the register
- Discharge permits in Gary
- Every permit record in Gary, A to Z
- Discharge permits in Indiana
- Every permit record in Indiana, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.